Improvement in adjustable desks



M.` STAHN.

Improvement :Lin Adjustable Desks.

Pemed July 23, 1872.

No.. |29,87o.

` Hmmm:

UNITED STATES PATENT OFFICE.

MATTHEUS sTAnN, vor BALTIMORE, MARYLAND.

IMPROVEMENT IN ADJUSTABLE DESKS.

Specilication forming part of Letters Patent N0. 129,870, dated July 23,1872.

Specification describing an Adjustable Stand,

invented by MATTHEUS STAHN, of Baltimore,

in the county of Baltimore and State of Maryland. i

The invention consists in a triangular stand formed in two hollowsections, one of which is raised or lowered within the other by means ofa windlass and held by clamp-screws, as hereinafter fully described andclaimed.

In "the drawing,` the figure is a perspective view.

A represents the lower and. outer section,

`which i's made triangular, and consists of the three vertical uprightsB and the horizontal y bars C. This frame is preferably placed uponcasters or rollers, so as to be readily and conveniently moved about aroom without the necessity of lifting. D is the upper and inner section,made of three vertical uprights, E, the cross-bars F, and the top andbottom G H. I is a windlass placed transversely in bearings on thestationary section A, and provided with a cord, J, whose ends areattached to the top and bottom G H, respectively. K is a ratchet, and Lthe .hand-crank by which the shaft is turned, while M isa detent-pawlwhich holds the ratchet and shaft so as to prevent backward motion. a aare set-screws, which clamp the sections together securely at any pointdesired. A shelf, N, is placed across the inside of stationary sectionA, and a hinged rest, O, on top of the adjustable section D. This standis especially adapted to photographers and students, as the rest O,which receives the camera of photographenthe book of the reader, or thepaper and other materials of the Y described.

' MATTHEUS STAHN.

Witnesses:

SoLoN C. KEMoN, THos. D. D. OURAND.

